Forends for AK created for placing additional modules, like grips, for recoil reduce, flashlight or even tactical lasers. All Special Forces now use modified forends, because it's increase their efficient!
Tactical forend for SMG is one of the most important parts in tuning. It's provide ability to add tactical modules, especially tactical grip, for better control of your SMG. It's very important in close combats. Plus, SMG created for CQB, and flashlight is very popular module for CQB.
Scout/Sniper Rifles Forends
Here you can find different small items, not included in all other categories, but they are still cool. Take a look on them.